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In this sentence, "friends" is the direct object. When the DO is a person or pet, Spanish uses an untranslated "personal a" before it.
I see my dad. Veo a mi papá.
We admire our teachers. Admiramos a nuestros profesores.
Do you hear your dog? ¿Oyes a tu perro?

marcy65brown: I got this too, with my answer ''I invite a lot of friends...." - it said I had an extra space after invite, and I should put "I invitea lot of friends.....!" Obviously an error on DL's part that needs to be fixed.

I’m confused about when to use “yo invito” vs “estoy invitando.” This question applies to lots of situations: “abro las ventanas” vs “estoy abriendo las ventanas.” Is there are rule about when to use which form?